# Day 21

#### Task 27 — Reverse engineering Day 21: HELP ME…I'm REVERSE ENGINEERING! <a href="#id-8d94" id="id-8d94"></a>

**1. What is the function name that downloads and executes files in the WarevilleApp.exe?**

1. Start the Machine and Open the ILSpy App on the Desktop.
2. Drag and drop `WarevilleApp` into ILSpy.
3. Click on WarevilleApp Package and navigate to `→ FancyApp → Form1`

```makefile
CopyAns: DownloadAndExecuteFile
```

**2. Once you execute the WarevilleApp.exe, it downloads another binary to the Downloads folder. What is the name of the binary?**

Observe the Code

```makefile
CopyAns: explorer.exe
```

**3. What domain name is the one from where the file is downloaded after running WarevilleApp.exe?**

Observe the Code

```makefile
CopyAns: mayorc2.thm
```

**4. The stage 2 binary is executed automatically and creates a zip file comprising the victim's computer data; what is the name of the zip file?**

1. Open a browser on the machine and navigate to [`http://mayorc2.thm:8080/dw/explorer.exe`](http://mayorc2.thm:8080/dw/explorer.exe) to download the stage 2 binary.
2. Drag and drop the file into ILSpy.
3. Expand the explorer package and navigate to `→ FileCollector → Program`

```makefile
CopyAns: CollectedFiles.zip
```

**5. What is the name of the C2 server where the stage 2 binary tries to upload files?**

Observe the

```makefile
CopyAns: anonymousc2.thm
```


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